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Costs - Compensation of key management personnel (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Costs      
Wages and salaries € 35 € 37 € 29
Post-employment benefits 3 3 3
Other long-term benefits 19 17 15
Indemnities upon termination of employment   9  
Key management personnel compensation € 57 € 66 € 47